我创建了一个名为 viewActivity 的活动。它显示windows系统中的共享文件和文件夹。我正在使用 jcifs.smb 包中的函数 listFiles() 。最初显示的是共享驱动器。我选择了递归调用 listFiles() 函数。也就是说,当我单击驱动器中的特定文件夹时,会显示文件的内容。当我再次单击前一个文件夹内的文件夹时,它的内容也会显示出来。这里的问题是当我在 android 中按下后退按钮时,它会调用上一个活动而不是返回上一个文件夹。那么如何实现这个功能呢?
//my package
package com.android.accesspc;
import java.net.MalformedURLException;
import jcifs.smb.NtlmPasswordAuthentication;
import jcifs.smb.SmbException;
import jcifs.smb.SmbFile;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.Toast;
public class viewActivity extends Activity{
int id=0;
SmbFile previous=null;
int count=0;
void list(SmbFile obj)
{
ScrollView sv = new ScrollView(this);
LinearLayout layout=new LinearLayout(this);
layout.setOrientation(0x00000001);
try
{
SmbFile a[]=obj.listFiles();
for(final SmbFile m:a)
{
if(!m.isHidden())
{
Button btn = new Button(this);
btn.setId(id);
if(m.isDirectory())
{
btn.setText(m.getName().replace("/",""));
btn.setTextSize((float)20);
btn.setOnClickListener(new
View.OnClickListener()
{
public void onClick(View v)
{
previous=m;//used to hold previous smb object
count++;//takes count of no of folders pressed
list(m);
}
});
}
else
{
btn.setText(m.getName());
}
layout.addView(btn);
id++;
}
}
sv.addView(layout);
setContentView(sv);
}
catch(SmbException e)
{
Toast displayMsg=Toast.makeText(this,"cannot list files",Toast.LENGTH_SHORT);
displayMsg.show();
}
}
String ip,name,password;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.view);
ip="192.168.0.100";//my ip address
name="abc";//my windows username
password="abcd";//my windows password
SmbFile dir=null;
String url= "smb://" + ip + "/";
NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication(null, name, password);
try
{
dir = new SmbFile(url, auth);
}
catch (MalformedURLException e1)
{
Toast displayMsg=Toast.makeText(this,"Network error",Toast.LENGTH_SHORT);
displayMsg.show();
}
//used to list files and folders of smb object initially
list(dir);
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
if(!(count==0))
{
//if count is not 0,that means the user has clicked a folder
//we have "previous" holding previous smb value which has to be called now
list(previous);
}
else
{
//the default behaviour
super.onBackPressed();
}
}
}